Entry 2 senses · 2 variants Webster, 1913 Marxist /mär'-ksəst/ · Marx·ist · IPA /ˈmɑːɹksɪst/ prop. n. prop. a. 01 prop. n. One who believes in the theories of Karl Marx. 1. One who believes in the theories of Karl Marx. 02 prop. a. Of or pertaining to Marx or Marxism. 1. Of or pertaining to Marx or Marxism.